Prof. Ioannis Chatzigiannakis
Sapienza University of Rome
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Academic Career Length
26Years (2001-Present)
(Calculated once Scilit publication data is synced: current year − year of first publication + 1)
Representative Publications
View All Publications2 October 2006
Conference Paper
Ioannis ChatzigiannakisAKAthanasios Kinalis
Athanasios Kinalis
SNSotiris Nikoletseas
Sotiris Nikoletseas
In wireless sensor networks data propagation is usually performed by sensors transmitting data towards a static control center (sink). Inspired by important applications (mostly related to ambient intelligence) and as a first step towards introducing mobility, we propose the idea of having a sink moving in the network area and collecting data from sensors. We propose four characteristic mobility patterns for the sink along with different data collection strategies. Through a detailed simulation study, we evaluate several important performance properties of each protocol. Our findings demonstrate that by taking advantage of the sink's mobility, we can significantly reduce the energy spent in relaying traffic and thus greatly extend the lifetime of the network. Copyright 2006 ACM
1 March 2008 in Computer Communications
Journal Article
Ioannis ChatzigiannakisAKAthanasios Kinalis
Athanasios Kinalis
SNSotiris Nikoletseas
Sotiris Nikoletseas
1 September 2016 in Computer Communications
Journal Article
Ioannis ChatzigiannakisAVAndrea Vitaletti
Andrea VitalettiAPApostolos Pyrgelis
Apostolos Pyrgelis
1 April 2017 in HardwareX
Journal Article
LPLidia Pocero
Lidia Pocero
DADimitrios Amaxilatis
Dimitrios AmaxilatisGMGeorgios Mylonas
Georgios MylonasIoannis ChatzigiannakisOne oft-cited strategy towards sustainability is improving energy efficiency inside public buildings. In this context, the educational buildings sector presents a very interesting and important case for the monitoring and management of buildings, since it addresses both energy and educational issues. In this work, we present and discuss the hardware IoT infrastructure substrate that provides real-time monitoring in multiple school buildings. We believe that such a system needs to follow an open design approach: rely on hardware-agnostic components that communicate over well-defined open interfaces. We present in detail the design of our hardware components, while also providing insights to the overall system design and a first set of results on their operation. The presented hardware components are utilized as the core hardware devices for GAIA, an EU research project aimed at the educational community. As our system has been deployed and tested in several public school buildings in Greece, we also report on its validation
1 July 2013
Conference Paper
ETEvangelos Theodoridis
Evangelos Theodoridis
GMGeorgios Mylonas
Georgios MylonasIoannis ChatzigiannakisIn this paper, we discuss key findings, technological challenges and socioeconomic opportunities in Smart City era. Most of the conclusions were gathered during SmartSantander project, an EU project that is developing a city-scale testbed for IoT and Future Internet experimentation, providing an integrated framework for implementing Smart City services.
1 May 2011 in Theoretical Computer Science
Journal Article
OMOthon Michail
Othon MichailIoannis ChatzigiannakisPSPaul G. Spirakis
Paul G. Spirakis
About Me
Prof. Ioannis Chatzigiannakis (male) holds a PhD from the University of Patras (2003) in the area of ad-hoc wireless mobile networks and a BEng from the University of Kent (1997) in Computer Systems Engineering. He is an Associate Professor at the "La Sapienza" University of Rome at the Department of Computer, Control and Management Engineering. He has co-authored over 150 scientific publications in areas related to dynamic distributed computing, internet of things, algorithm engineering and software systems. He has been a project manager and site leader for numerous research & development projects funded by the EU in the context of H2020, FP7, FP6, and EDA and has participated in the research & development teams of industrial projects. He has an active role in many open-source projects and regularly participates in open-source international events. He has started a number of technology-based start-ups related to the Internet-of-Things. He served as the Secretary of the European Association for Theoretical Computer Science (EATCS). He is a member of the ACM and IEEE.